SYNOPSIS:
    GDS_FIELD field axis sigma [amplify] [offset] [sigmafactor]

DESCRIPTION:
    Do a separated differentiated linear gaussian filter on
    a given /axis/ in a /field/.
    Field may be any dimension, as long as axis fits in.
    Sigma is the deviation of the gaussian in the spatial domain.
    Amplify is a factor that can be used to scale the result to
    a suitable range (default 1.0). Offset can be used to center
    the result around a given value, which is useful, if unsigned
    data is to be processed.

SEE ALSO:
    field, FILTB_NLD
